Boiler



Dec. 26, 1933. C, NEGENDANK 1,941,268

` BOILER Filed OCT.. 2l, 1952 Patented Dec. 26, 11933 i Y. Y

BOILER I Application October 21, 1932, Serial No. 638,886,

Y and in Germany DecemberZ, 1931 2'o1aims. (c1. 257-239) The heat delivering structures used in indirectsection through the boiler drum; Fig. 2 shows, ly heated high pressure heat exchangers comon an enlarged scale, a front view of the drum; monly comprise manifolds or headers and tubu- Fig. 3, a vertical section on line 3 3 Vof Fig. 2; lar elements whose ends are expanded into them. Fig. 4, a Vertical Seetion 011 line 4-4 0f Fig. 2.

6'; These structures lie entirely within the drum in and Fig. 5 a fragmentary section on line 5--5 of 6o which the steam for use is to be generated and Fig. 3. l communicate with the remaining part of the cir- The druml is provided at the one end with an cuit for the heat carrier by means of .portions opening 2 and at the opposite end with an openextending through the drum wall. This arrangeing' 3. Inside of the drum lies a heat delivering loment has proved entirely practical in use. The body consisting of the cover-shaped header or 65 heating structures must, however, be taken out collector 4 and harpin-shaped heating tubes 5. of the drum in case leaks occur and a reexpand- TheV collector or header 4 is seated from the ining of the ends of the tubular portions isv reside against the opening 2 like a manhole cover. quired. In order to obviate this inconvenience, The opening 3 at the opposite end of the drum the headers have at times been arranged outside is larger than the opening 2 by such an amount 7o of the drum. They have in such cases been given that the entire heat delivering body including the form of a lid or cover forming a closure for the header 4 can be introduced into the drum from the opening in the end of the drum and have been this end. The opening 3 is vclosed in the usual secured to the end of the drum by means of studs manner by the COVer 6. The' header 4 WhiCli or bolts. In practice, it has proved very dilcult closes the opening 2 is secured by means of yokes 75 i to keep the joint between the cover and the end '7 which engage ther end of the drum, studs 8 of the drum tight. Leakage has especially apwhich are secured to the header 4 and extend peared when the drum was rst heated up and through Openings in the yokes 7. and nuts `9 er1- is due mainly to the fact that the header is heated gaging the YOkeS 0n their Outer Side. The header more by the heating steam, which has higher is made out of a solid block of steel or other suit- 80 temperature than the contents of the drum, than able material. It has formed in it by any desired the wall of the drum and therefore expands more. means two large bOreS extending inwardly frOm This results in a permanent elongation of the one side 12, into which are screwed or othertuds or bolts so that upon cooling, the tension wise secured the two nipples 14'and15, extending of the boltsis insufficient to keep the joint tight. outwardly through opening 2 and equipped with g5 It is therefore necessary each time before., the connecting means such as flanges 16-16. One drum is heated up to kpull up on the stud nuts of these nipples supplies and the other removes thereby subjecting these bolts and the joint to rthe heating medium. Extending inwardly from severe usage.` v the other side 10 of the header are holes into By the present invention this diiculty is which are secured the pipes 5. These holes are 90 avoided and at the'same time the advantage is arranged in rows and extend entirely through retained that the rolled joints of the tubes are the block of steel or into the space within the accessible from the outside. nipples 14 and 15. Those which extend entirely The invention consists in having the drum clothrough the blOek are plugged iu any Suitable 40 sure seat from the inside against the lopening manner as e. g. by the rolled plugs 13 after the 95 in the drum, much like a manhole closure, and tubes 5 have been rolled in. For those holes openhaving the rolled joints for the :tubes all inside ing directly into the nipples 14 and l5 no closures of the drum opening. The means for securing at their outer ends are required. Transverse pasthis header are not subjected to stresses by the sages 17 connect those of'the holes not falling y j differential expansions of the `header and the` within the contour of the nipples with the in- 103 drum Vwall when heated up, since the interior terior of the nipples either directly or via the pressure in the drum keeps the cover tight on vertical connecting passages 18. The outer ends its seat. The rolled joints are readily accessible of these passages 17 and 18 are also suitably through the end opening of the drum and, complugged. The nipples 14vand 15 are secured in p pared with the arrangement having the headers place before the passages opening laterally into- 1x05 outside of the drum, there is the further advanthem are drilled. l tage that the loss through heat yradiation is re- What I claim is: duced. 1. In apparatus of the class described, the The drawing ShOWS arl illustrative exemple 0f combination of a drum having an opening in its the inventive idea. Fig. 1 ShOWS e longitudinal wall with a seat surrounding the opening on the 110 2. Apparatus in accordance with cam 1, the said opening being in one end of the drum, and the drum being further provided with an opening at the opposite end large enough to permit the insertion and removal of said header and tubes as a unit, the apparatus further comprising a closure for said second opening.Y

CURT NEGENDANK. 

